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Merge tag 'trace-v4.4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[people/ms/linux.git] / drivers / net / usb / cdc_ncm.c
1 /*
2 * cdc_ncm.c
3 *
4 * Copyright (C) ST-Ericsson 2010-2012
5 * Contact: Alexey Orishko <alexey.orishko@stericsson.com>
6 * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
7 *
8 * USB Host Driver for Network Control Model (NCM)
9 * http://www.usb.org/developers/docs/devclass_docs/NCM10_012011.zip
10 *
11 * The NCM encoding, decoding and initialization logic
12 * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
13 *
14 * This software is available to you under a choice of one of two
15 * licenses. You may choose this file to be licensed under the terms
16 * of the GNU General Public License (GPL) Version 2 or the 2-clause
17 * BSD license listed below:
18 *
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions
21 * are met:
22 * 1. Redistributions of source code must retain the above copyright
23 * notice, this list of conditions and the following disclaimer.
24 * 2. Redistributions in binary form must reproduce the above copyright
25 * notice, this list of conditions and the following disclaimer in the
26 * documentation and/or other materials provided with the distribution.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41 #include <linux/module.h>
42 #include <linux/netdevice.h>
43 #include <linux/ctype.h>
44 #include <linux/ethtool.h>
45 #include <linux/workqueue.h>
46 #include <linux/mii.h>
47 #include <linux/crc32.h>
48 #include <linux/usb.h>
49 #include <linux/hrtimer.h>
50 #include <linux/atomic.h>
51 #include <linux/usb/usbnet.h>
52 #include <linux/usb/cdc.h>
53 #include <linux/usb/cdc_ncm.h>
54
55 #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM)
56 static bool prefer_mbim = true;
57 #else
58 static bool prefer_mbim;
59 #endif
60 module_param(prefer_mbim, bool, S_IRUGO | S_IWUSR);
61 MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions");
62
63 static void cdc_ncm_txpath_bh(unsigned long param);
64 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
65 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
66 static struct usb_driver cdc_ncm_driver;
67
68 struct cdc_ncm_stats {
69 char stat_string[ETH_GSTRING_LEN];
70 int sizeof_stat;
71 int stat_offset;
72 };
73
74 #define CDC_NCM_STAT(str, m) { \
75 .stat_string = str, \
76 .sizeof_stat = sizeof(((struct cdc_ncm_ctx *)0)->m), \
77 .stat_offset = offsetof(struct cdc_ncm_ctx, m) }
78 #define CDC_NCM_SIMPLE_STAT(m) CDC_NCM_STAT(__stringify(m), m)
79
80 static const struct cdc_ncm_stats cdc_ncm_gstrings_stats[] = {
81 CDC_NCM_SIMPLE_STAT(tx_reason_ntb_full),
82 CDC_NCM_SIMPLE_STAT(tx_reason_ndp_full),
83 CDC_NCM_SIMPLE_STAT(tx_reason_timeout),
84 CDC_NCM_SIMPLE_STAT(tx_reason_max_datagram),
85 CDC_NCM_SIMPLE_STAT(tx_overhead),
86 CDC_NCM_SIMPLE_STAT(tx_ntbs),
87 CDC_NCM_SIMPLE_STAT(rx_overhead),
88 CDC_NCM_SIMPLE_STAT(rx_ntbs),
89 };
90
91 static int cdc_ncm_get_sset_count(struct net_device __always_unused *netdev, int sset)
92 {
93 switch (sset) {
94 case ETH_SS_STATS:
95 return ARRAY_SIZE(cdc_ncm_gstrings_stats);
96 default:
97 return -EOPNOTSUPP;
98 }
99 }
100
101 static void cdc_ncm_get_ethtool_stats(struct net_device *netdev,
102 struct ethtool_stats __always_unused *stats,
103 u64 *data)
104 {
105 struct usbnet *dev = netdev_priv(netdev);
106 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
107 int i;
108 char *p = NULL;
109
110 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
111 p = (char *)ctx + cdc_ncm_gstrings_stats[i].stat_offset;
112 data[i] = (cdc_ncm_gstrings_stats[i].sizeof_stat == sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
113 }
114 }
115
116 static void cdc_ncm_get_strings(struct net_device __always_unused *netdev, u32 stringset, u8 *data)
117 {
118 u8 *p = data;
119 int i;
120
121 switch (stringset) {
122 case ETH_SS_STATS:
123 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
124 memcpy(p, cdc_ncm_gstrings_stats[i].stat_string, ETH_GSTRING_LEN);
125 p += ETH_GSTRING_LEN;
126 }
127 }
128 }
129
130 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx);
131
132 static const struct ethtool_ops cdc_ncm_ethtool_ops = {
133 .get_settings = usbnet_get_settings,
134 .set_settings = usbnet_set_settings,
135 .get_link = usbnet_get_link,
136 .nway_reset = usbnet_nway_reset,
137 .get_drvinfo = usbnet_get_drvinfo,
138 .get_msglevel = usbnet_get_msglevel,
139 .set_msglevel = usbnet_set_msglevel,
140 .get_ts_info = ethtool_op_get_ts_info,
141 .get_sset_count = cdc_ncm_get_sset_count,
142 .get_strings = cdc_ncm_get_strings,
143 .get_ethtool_stats = cdc_ncm_get_ethtool_stats,
144 };
145
146 static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx)
147 {
148 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
149 u32 val, max, min;
150
151 /* clamp new_rx to sane values */
152 min = USB_CDC_NCM_NTB_MIN_IN_SIZE;
153 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
154
155 /* dwNtbInMaxSize spec violation? Use MIN size for both limits */
156 if (max < min) {
157 dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n",
158 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min);
159 max = min;
160 }
161
162 val = clamp_t(u32, new_rx, min, max);
163 if (val != new_rx)
164 dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range\n", min, max);
165
166 return val;
167 }
168
169 static u32 cdc_ncm_check_tx_max(struct usbnet *dev, u32 new_tx)
170 {
171 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
172 u32 val, max, min;
173
174 /* clamp new_tx to sane values */
175 min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16);
176 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_TX, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
177
178 /* some devices set dwNtbOutMaxSize too low for the above default */
179 min = min(min, max);
180
181 val = clamp_t(u32, new_tx, min, max);
182 if (val != new_tx)
183 dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range\n", min, max);
184
185 return val;
186 }
187
188 static ssize_t cdc_ncm_show_min_tx_pkt(struct device *d, struct device_attribute *attr, char *buf)
189 {
190 struct usbnet *dev = netdev_priv(to_net_dev(d));
191 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
192
193 return sprintf(buf, "%u\n", ctx->min_tx_pkt);
194 }
195
196 static ssize_t cdc_ncm_show_rx_max(struct device *d, struct device_attribute *attr, char *buf)
197 {
198 struct usbnet *dev = netdev_priv(to_net_dev(d));
199 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
200
201 return sprintf(buf, "%u\n", ctx->rx_max);
202 }
203
204 static ssize_t cdc_ncm_show_tx_max(struct device *d, struct device_attribute *attr, char *buf)
205 {
206 struct usbnet *dev = netdev_priv(to_net_dev(d));
207 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
208
209 return sprintf(buf, "%u\n", ctx->tx_max);
210 }
211
212 static ssize_t cdc_ncm_show_tx_timer_usecs(struct device *d, struct device_attribute *attr, char *buf)
213 {
214 struct usbnet *dev = netdev_priv(to_net_dev(d));
215 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
216
217 return sprintf(buf, "%u\n", ctx->timer_interval / (u32)NSEC_PER_USEC);
218 }
219
220 static ssize_t cdc_ncm_store_min_tx_pkt(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
221 {
222 struct usbnet *dev = netdev_priv(to_net_dev(d));
223 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
224 unsigned long val;
225
226 /* no need to restrict values - anything from 0 to infinity is OK */
227 if (kstrtoul(buf, 0, &val))
228 return -EINVAL;
229
230 ctx->min_tx_pkt = val;
231 return len;
232 }
233
234 static ssize_t cdc_ncm_store_rx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
235 {
236 struct usbnet *dev = netdev_priv(to_net_dev(d));
237 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
238 unsigned long val;
239
240 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_rx_max(dev, val) != val)
241 return -EINVAL;
242
243 cdc_ncm_update_rxtx_max(dev, val, ctx->tx_max);
244 return len;
245 }
246
247 static ssize_t cdc_ncm_store_tx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
248 {
249 struct usbnet *dev = netdev_priv(to_net_dev(d));
250 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
251 unsigned long val;
252
253 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_tx_max(dev, val) != val)
254 return -EINVAL;
255
256 cdc_ncm_update_rxtx_max(dev, ctx->rx_max, val);
257 return len;
258 }
259
260 static ssize_t cdc_ncm_store_tx_timer_usecs(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
261 {
262 struct usbnet *dev = netdev_priv(to_net_dev(d));
263 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
264 ssize_t ret;
265 unsigned long val;
266
267 ret = kstrtoul(buf, 0, &val);
268 if (ret)
269 return ret;
270 if (val && (val < CDC_NCM_TIMER_INTERVAL_MIN || val > CDC_NCM_TIMER_INTERVAL_MAX))
271 return -EINVAL;
272
273 spin_lock_bh(&ctx->mtx);
274 ctx->timer_interval = val * NSEC_PER_USEC;
275 if (!ctx->timer_interval)
276 ctx->tx_timer_pending = 0;
277 spin_unlock_bh(&ctx->mtx);
278 return len;
279 }
280
281 static DEVICE_ATTR(min_tx_pkt, S_IRUGO | S_IWUSR, cdc_ncm_show_min_tx_pkt, cdc_ncm_store_min_tx_pkt);
282 static DEVICE_ATTR(rx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_rx_max, cdc_ncm_store_rx_max);
283 static DEVICE_ATTR(tx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_max, cdc_ncm_store_tx_max);
284 static DEVICE_ATTR(tx_timer_usecs, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_timer_usecs, cdc_ncm_store_tx_timer_usecs);
285
286 #define NCM_PARM_ATTR(name, format, tocpu) \
287 static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \
288 { \
289 struct usbnet *dev = netdev_priv(to_net_dev(d)); \
290 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \
291 return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name)); \
292 } \
293 static DEVICE_ATTR(name, S_IRUGO, cdc_ncm_show_##name, NULL)
294
295 NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu);
296 NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu);
297 NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu);
298 NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu);
299 NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu);
300 NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu);
301 NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu);
302 NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu);
303 NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu);
304 NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu);
305
306 static struct attribute *cdc_ncm_sysfs_attrs[] = {
307 &dev_attr_min_tx_pkt.attr,
308 &dev_attr_rx_max.attr,
309 &dev_attr_tx_max.attr,
310 &dev_attr_tx_timer_usecs.attr,
311 &dev_attr_bmNtbFormatsSupported.attr,
312 &dev_attr_dwNtbInMaxSize.attr,
313 &dev_attr_wNdpInDivisor.attr,
314 &dev_attr_wNdpInPayloadRemainder.attr,
315 &dev_attr_wNdpInAlignment.attr,
316 &dev_attr_dwNtbOutMaxSize.attr,
317 &dev_attr_wNdpOutDivisor.attr,
318 &dev_attr_wNdpOutPayloadRemainder.attr,
319 &dev_attr_wNdpOutAlignment.attr,
320 &dev_attr_wNtbOutMaxDatagrams.attr,
321 NULL,
322 };
323
324 static struct attribute_group cdc_ncm_sysfs_attr_group = {
325 .name = "cdc_ncm",
326 .attrs = cdc_ncm_sysfs_attrs,
327 };
328
329 /* handle rx_max and tx_max changes */
330 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
331 {
332 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
333 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
334 u32 val;
335
336 val = cdc_ncm_check_rx_max(dev, new_rx);
337
338 /* inform device about NTB input size changes */
339 if (val != ctx->rx_max) {
340 __le32 dwNtbInMaxSize = cpu_to_le32(val);
341
342 dev_info(&dev->intf->dev, "setting rx_max = %u\n", val);
343
344 /* tell device to use new size */
345 if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
346 USB_TYPE_CLASS | USB_DIR_OUT
347 | USB_RECIP_INTERFACE,
348 0, iface_no, &dwNtbInMaxSize, 4) < 0)
349 dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
350 else
351 ctx->rx_max = val;
352 }
353
354 /* usbnet use these values for sizing rx queues */
355 if (dev->rx_urb_size != ctx->rx_max) {
356 dev->rx_urb_size = ctx->rx_max;
357 if (netif_running(dev->net))
358 usbnet_unlink_rx_urbs(dev);
359 }
360
361 val = cdc_ncm_check_tx_max(dev, new_tx);
362 if (val != ctx->tx_max)
363 dev_info(&dev->intf->dev, "setting tx_max = %u\n", val);
364
365 /* Adding a pad byte here if necessary simplifies the handling
366 * in cdc_ncm_fill_tx_frame, making tx_max always represent
367 * the real skb max size.
368 *
369 * We cannot use dev->maxpacket here because this is called from
370 * .bind which is called before usbnet sets up dev->maxpacket
371 */
372 if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
373 val % usb_maxpacket(dev->udev, dev->out, 1) == 0)
374 val++;
375
376 /* we might need to flush any pending tx buffers if running */
377 if (netif_running(dev->net) && val > ctx->tx_max) {
378 netif_tx_lock_bh(dev->net);
379 usbnet_start_xmit(NULL, dev->net);
380 /* make sure tx_curr_skb is reallocated if it was empty */
381 if (ctx->tx_curr_skb) {
382 dev_kfree_skb_any(ctx->tx_curr_skb);
383 ctx->tx_curr_skb = NULL;
384 }
385 ctx->tx_max = val;
386 netif_tx_unlock_bh(dev->net);
387 } else {
388 ctx->tx_max = val;
389 }
390
391 dev->hard_mtu = ctx->tx_max;
392
393 /* max qlen depend on hard_mtu and rx_urb_size */
394 usbnet_update_max_qlen(dev);
395
396 /* never pad more than 3 full USB packets per transfer */
397 ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out, 1),
398 CDC_NCM_MIN_TX_PKT, ctx->tx_max);
399 }
400
401 /* helpers for NCM and MBIM differences */
402 static u8 cdc_ncm_flags(struct usbnet *dev)
403 {
404 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
405
406 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
407 return ctx->mbim_desc->bmNetworkCapabilities;
408 if (ctx->func_desc)
409 return ctx->func_desc->bmNetworkCapabilities;
410 return 0;
411 }
412
413 static int cdc_ncm_eth_hlen(struct usbnet *dev)
414 {
415 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
416 return 0;
417 return ETH_HLEN;
418 }
419
420 static u32 cdc_ncm_min_dgram_size(struct usbnet *dev)
421 {
422 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
423 return CDC_MBIM_MIN_DATAGRAM_SIZE;
424 return CDC_NCM_MIN_DATAGRAM_SIZE;
425 }
426
427 static u32 cdc_ncm_max_dgram_size(struct usbnet *dev)
428 {
429 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
430
431 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
432 return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
433 if (ctx->ether_desc)
434 return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
435 return CDC_NCM_MAX_DATAGRAM_SIZE;
436 }
437
438 /* initial one-time device setup. MUST be called with the data interface
439 * in altsetting 0
440 */
441 static int cdc_ncm_init(struct usbnet *dev)
442 {
443 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
444 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
445 int err;
446
447 err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
448 USB_TYPE_CLASS | USB_DIR_IN
449 |USB_RECIP_INTERFACE,
450 0, iface_no, &ctx->ncm_parm,
451 sizeof(ctx->ncm_parm));
452 if (err < 0) {
453 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n");
454 return err; /* GET_NTB_PARAMETERS is required */
455 }
456
457 /* set CRC Mode */
458 if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) {
459 dev_dbg(&dev->intf->dev, "Setting CRC mode off\n");
460 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
461 USB_TYPE_CLASS | USB_DIR_OUT
462 | USB_RECIP_INTERFACE,
463 USB_CDC_NCM_CRC_NOT_APPENDED,
464 iface_no, NULL, 0);
465 if (err < 0)
466 dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n");
467 }
468
469 /* set NTB format, if both formats are supported.
470 *
471 * "The host shall only send this command while the NCM Data
472 * Interface is in alternate setting 0."
473 */
474 if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) &
475 USB_CDC_NCM_NTB32_SUPPORTED) {
476 dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n");
477 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
478 USB_TYPE_CLASS | USB_DIR_OUT
479 | USB_RECIP_INTERFACE,
480 USB_CDC_NCM_NTB16_FORMAT,
481 iface_no, NULL, 0);
482 if (err < 0)
483 dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n");
484 }
485
486 /* set initial device values */
487 ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
488 ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
489 ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
490 ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
491 ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
492 /* devices prior to NCM Errata shall set this field to zero */
493 ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
494
495 dev_dbg(&dev->intf->dev,
496 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
497 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
498 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev));
499
500 /* max count of tx datagrams */
501 if ((ctx->tx_max_datagrams == 0) ||
502 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
503 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
504
505 /* set up maximum NDP size */
506 ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16);
507
508 /* initial coalescing timer interval */
509 ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC;
510
511 return 0;
512 }
513
514 /* set a new max datagram size */
515 static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size)
516 {
517 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
518 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
519 __le16 max_datagram_size;
520 u16 mbim_mtu;
521 int err;
522
523 /* set default based on descriptors */
524 ctx->max_datagram_size = clamp_t(u32, new_size,
525 cdc_ncm_min_dgram_size(dev),
526 CDC_NCM_MAX_DATAGRAM_SIZE);
527
528 /* inform the device about the selected Max Datagram Size? */
529 if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE))
530 goto out;
531
532 /* read current mtu value from device */
533 err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
534 USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
535 0, iface_no, &max_datagram_size, 2);
536 if (err < 0) {
537 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n");
538 goto out;
539 }
540
541 if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size)
542 goto out;
543
544 max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
545 err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE,
546 USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
547 0, iface_no, &max_datagram_size, 2);
548 if (err < 0)
549 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n");
550
551 out:
552 /* set MTU to max supported by the device if necessary */
553 dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev));
554
555 /* do not exceed operater preferred MTU */
556 if (ctx->mbim_extended_desc) {
557 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU);
558 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu)
559 dev->net->mtu = mbim_mtu;
560 }
561 }
562
563 static void cdc_ncm_fix_modulus(struct usbnet *dev)
564 {
565 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
566 u32 val;
567
568 /*
569 * verify that the structure alignment is:
570 * - power of two
571 * - not greater than the maximum transmit length
572 * - not less than four bytes
573 */
574 val = ctx->tx_ndp_modulus;
575
576 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
577 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
578 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n");
579 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
580 }
581
582 /*
583 * verify that the payload alignment is:
584 * - power of two
585 * - not greater than the maximum transmit length
586 * - not less than four bytes
587 */
588 val = ctx->tx_modulus;
589
590 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
591 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
592 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n");
593 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
594 }
595
596 /* verify the payload remainder */
597 if (ctx->tx_remainder >= ctx->tx_modulus) {
598 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n");
599 ctx->tx_remainder = 0;
600 }
601
602 /* adjust TX-remainder according to NCM specification. */
603 ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) &
604 (ctx->tx_modulus - 1));
605 }
606
607 static int cdc_ncm_setup(struct usbnet *dev)
608 {
609 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
610 u32 def_rx, def_tx;
611
612 /* be conservative when selecting intial buffer size to
613 * increase the number of hosts this will work for
614 */
615 def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX,
616 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
617 def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX,
618 le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
619
620 /* clamp rx_max and tx_max and inform device */
621 cdc_ncm_update_rxtx_max(dev, def_rx, def_tx);
622
623 /* sanitize the modulus and remainder values */
624 cdc_ncm_fix_modulus(dev);
625
626 /* set max datagram size */
627 cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev));
628 return 0;
629 }
630
631 static void
632 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
633 {
634 struct usb_host_endpoint *e, *in = NULL, *out = NULL;
635 u8 ep;
636
637 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
638
639 e = intf->cur_altsetting->endpoint + ep;
640 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
641 case USB_ENDPOINT_XFER_INT:
642 if (usb_endpoint_dir_in(&e->desc)) {
643 if (!dev->status)
644 dev->status = e;
645 }
646 break;
647
648 case USB_ENDPOINT_XFER_BULK:
649 if (usb_endpoint_dir_in(&e->desc)) {
650 if (!in)
651 in = e;
652 } else {
653 if (!out)
654 out = e;
655 }
656 break;
657
658 default:
659 break;
660 }
661 }
662 if (in && !dev->in)
663 dev->in = usb_rcvbulkpipe(dev->udev,
664 in->desc.bEndpointAddress &
665 USB_ENDPOINT_NUMBER_MASK);
666 if (out && !dev->out)
667 dev->out = usb_sndbulkpipe(dev->udev,
668 out->desc.bEndpointAddress &
669 USB_ENDPOINT_NUMBER_MASK);
670 }
671
672 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
673 {
674 if (ctx == NULL)
675 return;
676
677 if (ctx->tx_rem_skb != NULL) {
678 dev_kfree_skb_any(ctx->tx_rem_skb);
679 ctx->tx_rem_skb = NULL;
680 }
681
682 if (ctx->tx_curr_skb != NULL) {
683 dev_kfree_skb_any(ctx->tx_curr_skb);
684 ctx->tx_curr_skb = NULL;
685 }
686
687 kfree(ctx->delayed_ndp16);
688
689 kfree(ctx);
690 }
691
692 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags)
693 {
694 const struct usb_cdc_union_desc *union_desc = NULL;
695 struct cdc_ncm_ctx *ctx;
696 struct usb_driver *driver;
697 u8 *buf;
698 int len;
699 int temp;
700 u8 iface_no;
701 struct usb_cdc_parsed_header hdr;
702
703 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
704 if (!ctx)
705 return -ENOMEM;
706
707 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
708 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
709 ctx->bh.data = (unsigned long)dev;
710 ctx->bh.func = cdc_ncm_txpath_bh;
711 atomic_set(&ctx->stop, 0);
712 spin_lock_init(&ctx->mtx);
713
714 /* store ctx pointer in device data field */
715 dev->data[0] = (unsigned long)ctx;
716
717 /* only the control interface can be successfully probed */
718 ctx->control = intf;
719
720 /* get some pointers */
721 driver = driver_of(intf);
722 buf = intf->cur_altsetting->extra;
723 len = intf->cur_altsetting->extralen;
724
725 /* parse through descriptors associated with control interface */
726 cdc_parse_cdc_header(&hdr, intf, buf, len);
727
728 ctx->data = usb_ifnum_to_if(dev->udev,
729 hdr.usb_cdc_union_desc->bSlaveInterface0);
730 ctx->ether_desc = hdr.usb_cdc_ether_desc;
731 ctx->func_desc = hdr.usb_cdc_ncm_desc;
732 ctx->mbim_desc = hdr.usb_cdc_mbim_desc;
733 ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc;
734
735 /* some buggy devices have an IAD but no CDC Union */
736 if (!union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
737 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
738 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
739 }
740
741 /* check if we got everything */
742 if (!ctx->data) {
743 dev_dbg(&intf->dev, "CDC Union missing and no IAD found\n");
744 goto error;
745 }
746 if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) {
747 if (!ctx->mbim_desc) {
748 dev_dbg(&intf->dev, "MBIM functional descriptor missing\n");
749 goto error;
750 }
751 } else {
752 if (!ctx->ether_desc || !ctx->func_desc) {
753 dev_dbg(&intf->dev, "NCM or ECM functional descriptors missing\n");
754 goto error;
755 }
756 }
757
758 /* claim data interface, if different from control */
759 if (ctx->data != ctx->control) {
760 temp = usb_driver_claim_interface(driver, ctx->data, dev);
761 if (temp) {
762 dev_dbg(&intf->dev, "failed to claim data intf\n");
763 goto error;
764 }
765 }
766
767 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
768
769 /* reset data interface */
770 temp = usb_set_interface(dev->udev, iface_no, 0);
771 if (temp) {
772 dev_dbg(&intf->dev, "set interface failed\n");
773 goto error2;
774 }
775
776 /* initialize basic device settings */
777 if (cdc_ncm_init(dev))
778 goto error2;
779
780 /* configure data interface */
781 temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
782 if (temp) {
783 dev_dbg(&intf->dev, "set interface failed\n");
784 goto error2;
785 }
786
787 cdc_ncm_find_endpoints(dev, ctx->data);
788 cdc_ncm_find_endpoints(dev, ctx->control);
789 if (!dev->in || !dev->out || !dev->status) {
790 dev_dbg(&intf->dev, "failed to collect endpoints\n");
791 goto error2;
792 }
793
794 usb_set_intfdata(ctx->data, dev);
795 usb_set_intfdata(ctx->control, dev);
796
797 if (ctx->ether_desc) {
798 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
799 if (temp) {
800 dev_dbg(&intf->dev, "failed to get mac address\n");
801 goto error2;
802 }
803 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
804 }
805
806 /* finish setting up the device specific data */
807 cdc_ncm_setup(dev);
808
809 /* Device-specific flags */
810 ctx->drvflags = drvflags;
811
812 /* Allocate the delayed NDP if needed. */
813 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
814 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
815 if (!ctx->delayed_ndp16)
816 goto error2;
817 dev_info(&intf->dev, "NDP will be placed at end of frame for this device.");
818 }
819
820 /* override ethtool_ops */
821 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
822
823 /* add our sysfs attrs */
824 dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group;
825
826 return 0;
827
828 error2:
829 usb_set_intfdata(ctx->control, NULL);
830 usb_set_intfdata(ctx->data, NULL);
831 if (ctx->data != ctx->control)
832 usb_driver_release_interface(driver, ctx->data);
833 error:
834 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
835 dev->data[0] = 0;
836 dev_info(&intf->dev, "bind() failure\n");
837 return -ENODEV;
838 }
839 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
840
841 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
842 {
843 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
844 struct usb_driver *driver = driver_of(intf);
845
846 if (ctx == NULL)
847 return; /* no setup */
848
849 atomic_set(&ctx->stop, 1);
850
851 if (hrtimer_active(&ctx->tx_timer))
852 hrtimer_cancel(&ctx->tx_timer);
853
854 tasklet_kill(&ctx->bh);
855
856 /* handle devices with combined control and data interface */
857 if (ctx->control == ctx->data)
858 ctx->data = NULL;
859
860 /* disconnect master --> disconnect slave */
861 if (intf == ctx->control && ctx->data) {
862 usb_set_intfdata(ctx->data, NULL);
863 usb_driver_release_interface(driver, ctx->data);
864 ctx->data = NULL;
865
866 } else if (intf == ctx->data && ctx->control) {
867 usb_set_intfdata(ctx->control, NULL);
868 usb_driver_release_interface(driver, ctx->control);
869 ctx->control = NULL;
870 }
871
872 usb_set_intfdata(intf, NULL);
873 cdc_ncm_free(ctx);
874 }
875 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
876
877 /* Return the number of the MBIM control interface altsetting iff it
878 * is preferred and available,
879 */
880 u8 cdc_ncm_select_altsetting(struct usb_interface *intf)
881 {
882 struct usb_host_interface *alt;
883
884 /* The MBIM spec defines a NCM compatible default altsetting,
885 * which we may have matched:
886 *
887 * "Functions that implement both NCM 1.0 and MBIM (an
888 * “NCM/MBIM function”) according to this recommendation
889 * shall provide two alternate settings for the
890 * Communication Interface. Alternate setting 0, and the
891 * associated class and endpoint descriptors, shall be
892 * constructed according to the rules given for the
893 * Communication Interface in section 5 of [USBNCM10].
894 * Alternate setting 1, and the associated class and
895 * endpoint descriptors, shall be constructed according to
896 * the rules given in section 6 (USB Device Model) of this
897 * specification."
898 */
899 if (intf->num_altsetting < 2)
900 return intf->cur_altsetting->desc.bAlternateSetting;
901
902 if (prefer_mbim) {
903 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
904 if (alt && cdc_ncm_comm_intf_is_mbim(alt))
905 return CDC_NCM_COMM_ALTSETTING_MBIM;
906 }
907 return CDC_NCM_COMM_ALTSETTING_NCM;
908 }
909 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
910
911 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
912 {
913 int ret;
914
915 /* MBIM backwards compatible function? */
916 if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM)
917 return -ENODEV;
918
919 /* The NCM data altsetting is fixed, so we hard-coded it.
920 * Additionally, generic NCM devices are assumed to accept arbitrarily
921 * placed NDP.
922 */
923 ret = cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM, 0);
924
925 /*
926 * We should get an event when network connection is "connected" or
927 * "disconnected". Set network connection in "disconnected" state
928 * (carrier is OFF) during attach, so the IP network stack does not
929 * start IPv6 negotiation and more.
930 */
931 usbnet_link_change(dev, 0, 0);
932 return ret;
933 }
934
935 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
936 {
937 size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
938
939 if (skb->len + align > max)
940 align = max - skb->len;
941 if (align && skb_tailroom(skb) >= align)
942 memset(skb_put(skb, align), 0, align);
943 }
944
945 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
946 * allocating a new one within skb
947 */
948 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
949 {
950 struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
951 struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
952 size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
953
954 /* If NDP should be moved to the end of the NCM package, we can't follow the
955 * NTH16 header as we would normally do. NDP isn't written to the SKB yet, and
956 * the wNdpIndex field in the header is actually not consistent with reality. It will be later.
957 */
958 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)
959 if (ctx->delayed_ndp16->dwSignature == sign)
960 return ctx->delayed_ndp16;
961
962 /* follow the chain of NDPs, looking for a match */
963 while (ndpoffset) {
964 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
965 if (ndp16->dwSignature == sign)
966 return ndp16;
967 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
968 }
969
970 /* align new NDP */
971 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
972 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max);
973
974 /* verify that there is room for the NDP and the datagram (reserve) */
975 if ((ctx->tx_max - skb->len - reserve) < ctx->max_ndp_size)
976 return NULL;
977
978 /* link to it */
979 if (ndp16)
980 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
981 else
982 nth16->wNdpIndex = cpu_to_le16(skb->len);
983
984 /* push a new empty NDP */
985 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
986 ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, ctx->max_ndp_size), 0, ctx->max_ndp_size);
987 else
988 ndp16 = ctx->delayed_ndp16;
989
990 ndp16->dwSignature = sign;
991 ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
992 return ndp16;
993 }
994
995 struct sk_buff *
996 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
997 {
998 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
999 struct usb_cdc_ncm_nth16 *nth16;
1000 struct usb_cdc_ncm_ndp16 *ndp16;
1001 struct sk_buff *skb_out;
1002 u16 n = 0, index, ndplen;
1003 u8 ready2send = 0;
1004 u32 delayed_ndp_size;
1005
1006 /* When our NDP gets written in cdc_ncm_ndp(), then skb_out->len gets updated
1007 * accordingly. Otherwise, we should check here.
1008 */
1009 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)
1010 delayed_ndp_size = ctx->max_ndp_size;
1011 else
1012 delayed_ndp_size = 0;
1013
1014 /* if there is a remaining skb, it gets priority */
1015 if (skb != NULL) {
1016 swap(skb, ctx->tx_rem_skb);
1017 swap(sign, ctx->tx_rem_sign);
1018 } else {
1019 ready2send = 1;
1020 }
1021
1022 /* check if we are resuming an OUT skb */
1023 skb_out = ctx->tx_curr_skb;
1024
1025 /* allocate a new OUT skb */
1026 if (!skb_out) {
1027 skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC);
1028 if (skb_out == NULL) {
1029 if (skb != NULL) {
1030 dev_kfree_skb_any(skb);
1031 dev->net->stats.tx_dropped++;
1032 }
1033 goto exit_no_skb;
1034 }
1035 /* fill out the initial 16-bit NTB header */
1036 nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16));
1037 nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
1038 nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
1039 nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
1040
1041 /* count total number of frames in this NTB */
1042 ctx->tx_curr_frame_num = 0;
1043
1044 /* recent payload counter for this skb_out */
1045 ctx->tx_curr_frame_payload = 0;
1046 }
1047
1048 for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
1049 /* send any remaining skb first */
1050 if (skb == NULL) {
1051 skb = ctx->tx_rem_skb;
1052 sign = ctx->tx_rem_sign;
1053 ctx->tx_rem_skb = NULL;
1054
1055 /* check for end of skb */
1056 if (skb == NULL)
1057 break;
1058 }
1059
1060 /* get the appropriate NDP for this skb */
1061 ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1062
1063 /* align beginning of next frame */
1064 cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max);
1065
1066 /* check if we had enough room left for both NDP and frame */
1067 if (!ndp16 || skb_out->len + skb->len + delayed_ndp_size > ctx->tx_max) {
1068 if (n == 0) {
1069 /* won't fit, MTU problem? */
1070 dev_kfree_skb_any(skb);
1071 skb = NULL;
1072 dev->net->stats.tx_dropped++;
1073 } else {
1074 /* no room for skb - store for later */
1075 if (ctx->tx_rem_skb != NULL) {
1076 dev_kfree_skb_any(ctx->tx_rem_skb);
1077 dev->net->stats.tx_dropped++;
1078 }
1079 ctx->tx_rem_skb = skb;
1080 ctx->tx_rem_sign = sign;
1081 skb = NULL;
1082 ready2send = 1;
1083 ctx->tx_reason_ntb_full++; /* count reason for transmitting */
1084 }
1085 break;
1086 }
1087
1088 /* calculate frame number withing this NDP */
1089 ndplen = le16_to_cpu(ndp16->wLength);
1090 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
1091
1092 /* OK, add this skb */
1093 ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
1094 ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
1095 ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
1096 memcpy(skb_put(skb_out, skb->len), skb->data, skb->len);
1097 ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */
1098 dev_kfree_skb_any(skb);
1099 skb = NULL;
1100
1101 /* send now if this NDP is full */
1102 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
1103 ready2send = 1;
1104 ctx->tx_reason_ndp_full++; /* count reason for transmitting */
1105 break;
1106 }
1107 }
1108
1109 /* free up any dangling skb */
1110 if (skb != NULL) {
1111 dev_kfree_skb_any(skb);
1112 skb = NULL;
1113 dev->net->stats.tx_dropped++;
1114 }
1115
1116 ctx->tx_curr_frame_num = n;
1117
1118 if (n == 0) {
1119 /* wait for more frames */
1120 /* push variables */
1121 ctx->tx_curr_skb = skb_out;
1122 goto exit_no_skb;
1123
1124 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) {
1125 /* wait for more frames */
1126 /* push variables */
1127 ctx->tx_curr_skb = skb_out;
1128 /* set the pending count */
1129 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
1130 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
1131 goto exit_no_skb;
1132
1133 } else {
1134 if (n == ctx->tx_max_datagrams)
1135 ctx->tx_reason_max_datagram++; /* count reason for transmitting */
1136 /* frame goes out */
1137 /* variables will be reset at next call */
1138 }
1139
1140 /* If requested, put NDP at end of frame. */
1141 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1142 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1143 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_max);
1144 nth16->wNdpIndex = cpu_to_le16(skb_out->len);
1145 memcpy(skb_put(skb_out, ctx->max_ndp_size), ctx->delayed_ndp16, ctx->max_ndp_size);
1146
1147 /* Zero out delayed NDP - signature checking will naturally fail. */
1148 ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size);
1149 }
1150
1151 /* If collected data size is less or equal ctx->min_tx_pkt
1152 * bytes, we send buffers as it is. If we get more data, it
1153 * would be more efficient for USB HS mobile device with DMA
1154 * engine to receive a full size NTB, than canceling DMA
1155 * transfer and receiving a short packet.
1156 *
1157 * This optimization support is pointless if we end up sending
1158 * a ZLP after full sized NTBs.
1159 */
1160 if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
1161 skb_out->len > ctx->min_tx_pkt)
1162 memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0,
1163 ctx->tx_max - skb_out->len);
1164 else if (skb_out->len < ctx->tx_max && (skb_out->len % dev->maxpacket) == 0)
1165 *skb_put(skb_out, 1) = 0; /* force short packet */
1166
1167 /* set final frame length */
1168 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1169 nth16->wBlockLength = cpu_to_le16(skb_out->len);
1170
1171 /* return skb */
1172 ctx->tx_curr_skb = NULL;
1173
1174 /* keep private stats: framing overhead and number of NTBs */
1175 ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload;
1176 ctx->tx_ntbs++;
1177
1178 /* usbnet will count all the framing overhead by default.
1179 * Adjust the stats so that the tx_bytes counter show real
1180 * payload data instead.
1181 */
1182 usbnet_set_skb_tx_stats(skb_out, n,
1183 (long)ctx->tx_curr_frame_payload - skb_out->len);
1184
1185 return skb_out;
1186
1187 exit_no_skb:
1188 /* Start timer, if there is a remaining non-empty skb */
1189 if (ctx->tx_curr_skb != NULL && n > 0)
1190 cdc_ncm_tx_timeout_start(ctx);
1191 return NULL;
1192 }
1193 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
1194
1195 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
1196 {
1197 /* start timer, if not already started */
1198 if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
1199 hrtimer_start(&ctx->tx_timer,
1200 ktime_set(0, ctx->timer_interval),
1201 HRTIMER_MODE_REL);
1202 }
1203
1204 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
1205 {
1206 struct cdc_ncm_ctx *ctx =
1207 container_of(timer, struct cdc_ncm_ctx, tx_timer);
1208
1209 if (!atomic_read(&ctx->stop))
1210 tasklet_schedule(&ctx->bh);
1211 return HRTIMER_NORESTART;
1212 }
1213
1214 static void cdc_ncm_txpath_bh(unsigned long param)
1215 {
1216 struct usbnet *dev = (struct usbnet *)param;
1217 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1218
1219 spin_lock_bh(&ctx->mtx);
1220 if (ctx->tx_timer_pending != 0) {
1221 ctx->tx_timer_pending--;
1222 cdc_ncm_tx_timeout_start(ctx);
1223 spin_unlock_bh(&ctx->mtx);
1224 } else if (dev->net != NULL) {
1225 ctx->tx_reason_timeout++; /* count reason for transmitting */
1226 spin_unlock_bh(&ctx->mtx);
1227 netif_tx_lock_bh(dev->net);
1228 usbnet_start_xmit(NULL, dev->net);
1229 netif_tx_unlock_bh(dev->net);
1230 } else {
1231 spin_unlock_bh(&ctx->mtx);
1232 }
1233 }
1234
1235 struct sk_buff *
1236 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
1237 {
1238 struct sk_buff *skb_out;
1239 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1240
1241 /*
1242 * The Ethernet API we are using does not support transmitting
1243 * multiple Ethernet frames in a single call. This driver will
1244 * accumulate multiple Ethernet frames and send out a larger
1245 * USB frame when the USB buffer is full or when a single jiffies
1246 * timeout happens.
1247 */
1248 if (ctx == NULL)
1249 goto error;
1250
1251 spin_lock_bh(&ctx->mtx);
1252 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
1253 spin_unlock_bh(&ctx->mtx);
1254 return skb_out;
1255
1256 error:
1257 if (skb != NULL)
1258 dev_kfree_skb_any(skb);
1259
1260 return NULL;
1261 }
1262 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
1263
1264 /* verify NTB header and return offset of first NDP, or negative error */
1265 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1266 {
1267 struct usbnet *dev = netdev_priv(skb_in->dev);
1268 struct usb_cdc_ncm_nth16 *nth16;
1269 int len;
1270 int ret = -EINVAL;
1271
1272 if (ctx == NULL)
1273 goto error;
1274
1275 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
1276 sizeof(struct usb_cdc_ncm_ndp16))) {
1277 netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1278 goto error;
1279 }
1280
1281 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
1282
1283 if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
1284 netif_dbg(dev, rx_err, dev->net,
1285 "invalid NTH16 signature <%#010x>\n",
1286 le32_to_cpu(nth16->dwSignature));
1287 goto error;
1288 }
1289
1290 len = le16_to_cpu(nth16->wBlockLength);
1291 if (len > ctx->rx_max) {
1292 netif_dbg(dev, rx_err, dev->net,
1293 "unsupported NTB block length %u/%u\n", len,
1294 ctx->rx_max);
1295 goto error;
1296 }
1297
1298 if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
1299 (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
1300 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
1301 netif_dbg(dev, rx_err, dev->net,
1302 "sequence number glitch prev=%d curr=%d\n",
1303 ctx->rx_seq, le16_to_cpu(nth16->wSequence));
1304 }
1305 ctx->rx_seq = le16_to_cpu(nth16->wSequence);
1306
1307 ret = le16_to_cpu(nth16->wNdpIndex);
1308 error:
1309 return ret;
1310 }
1311 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
1312
1313 /* verify NDP header and return number of datagrams, or negative error */
1314 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
1315 {
1316 struct usbnet *dev = netdev_priv(skb_in->dev);
1317 struct usb_cdc_ncm_ndp16 *ndp16;
1318 int ret = -EINVAL;
1319
1320 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
1321 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset <%u>\n",
1322 ndpoffset);
1323 goto error;
1324 }
1325 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1326
1327 if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1328 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n",
1329 le16_to_cpu(ndp16->wLength));
1330 goto error;
1331 }
1332
1333 ret = ((le16_to_cpu(ndp16->wLength) -
1334 sizeof(struct usb_cdc_ncm_ndp16)) /
1335 sizeof(struct usb_cdc_ncm_dpe16));
1336 ret--; /* we process NDP entries except for the last one */
1337
1338 if ((sizeof(struct usb_cdc_ncm_ndp16) +
1339 ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) {
1340 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1341 ret = -EINVAL;
1342 }
1343
1344 error:
1345 return ret;
1346 }
1347 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
1348
1349 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
1350 {
1351 struct sk_buff *skb;
1352 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1353 int len;
1354 int nframes;
1355 int x;
1356 int offset;
1357 struct usb_cdc_ncm_ndp16 *ndp16;
1358 struct usb_cdc_ncm_dpe16 *dpe16;
1359 int ndpoffset;
1360 int loopcount = 50; /* arbitrary max preventing infinite loop */
1361 u32 payload = 0;
1362
1363 ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
1364 if (ndpoffset < 0)
1365 goto error;
1366
1367 next_ndp:
1368 nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
1369 if (nframes < 0)
1370 goto error;
1371
1372 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1373
1374 if (ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) {
1375 netif_dbg(dev, rx_err, dev->net,
1376 "invalid DPT16 signature <%#010x>\n",
1377 le32_to_cpu(ndp16->dwSignature));
1378 goto err_ndp;
1379 }
1380 dpe16 = ndp16->dpe16;
1381
1382 for (x = 0; x < nframes; x++, dpe16++) {
1383 offset = le16_to_cpu(dpe16->wDatagramIndex);
1384 len = le16_to_cpu(dpe16->wDatagramLength);
1385
1386 /*
1387 * CDC NCM ch. 3.7
1388 * All entries after first NULL entry are to be ignored
1389 */
1390 if ((offset == 0) || (len == 0)) {
1391 if (!x)
1392 goto err_ndp; /* empty NTB */
1393 break;
1394 }
1395
1396 /* sanity checking */
1397 if (((offset + len) > skb_in->len) ||
1398 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1399 netif_dbg(dev, rx_err, dev->net,
1400 "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
1401 x, offset, len, skb_in);
1402 if (!x)
1403 goto err_ndp;
1404 break;
1405
1406 } else {
1407 /* create a fresh copy to reduce truesize */
1408 skb = netdev_alloc_skb_ip_align(dev->net, len);
1409 if (!skb)
1410 goto error;
1411 memcpy(skb_put(skb, len), skb_in->data + offset, len);
1412 usbnet_skb_return(dev, skb);
1413 payload += len; /* count payload bytes in this NTB */
1414 }
1415 }
1416 err_ndp:
1417 /* are there more NDPs to process? */
1418 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1419 if (ndpoffset && loopcount--)
1420 goto next_ndp;
1421
1422 /* update stats */
1423 ctx->rx_overhead += skb_in->len - payload;
1424 ctx->rx_ntbs++;
1425
1426 return 1;
1427 error:
1428 return 0;
1429 }
1430 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1431
1432 static void
1433 cdc_ncm_speed_change(struct usbnet *dev,
1434 struct usb_cdc_speed_change *data)
1435 {
1436 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1437 uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1438
1439 /*
1440 * Currently the USB-NET API does not support reporting the actual
1441 * device speed. Do print it instead.
1442 */
1443 if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1444 netif_info(dev, link, dev->net,
1445 "%u mbit/s downlink %u mbit/s uplink\n",
1446 (unsigned int)(rx_speed / 1000000U),
1447 (unsigned int)(tx_speed / 1000000U));
1448 } else {
1449 netif_info(dev, link, dev->net,
1450 "%u kbit/s downlink %u kbit/s uplink\n",
1451 (unsigned int)(rx_speed / 1000U),
1452 (unsigned int)(tx_speed / 1000U));
1453 }
1454 }
1455
1456 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1457 {
1458 struct cdc_ncm_ctx *ctx;
1459 struct usb_cdc_notification *event;
1460
1461 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1462
1463 if (urb->actual_length < sizeof(*event))
1464 return;
1465
1466 /* test for split data in 8-byte chunks */
1467 if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1468 cdc_ncm_speed_change(dev,
1469 (struct usb_cdc_speed_change *)urb->transfer_buffer);
1470 return;
1471 }
1472
1473 event = urb->transfer_buffer;
1474
1475 switch (event->bNotificationType) {
1476 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1477 /*
1478 * According to the CDC NCM specification ch.7.1
1479 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1480 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1481 */
1482 netif_info(dev, link, dev->net,
1483 "network connection: %sconnected\n",
1484 !!event->wValue ? "" : "dis");
1485 usbnet_link_change(dev, !!event->wValue, 0);
1486 break;
1487
1488 case USB_CDC_NOTIFY_SPEED_CHANGE:
1489 if (urb->actual_length < (sizeof(*event) +
1490 sizeof(struct usb_cdc_speed_change)))
1491 set_bit(EVENT_STS_SPLIT, &dev->flags);
1492 else
1493 cdc_ncm_speed_change(dev,
1494 (struct usb_cdc_speed_change *)&event[1]);
1495 break;
1496
1497 default:
1498 dev_dbg(&dev->udev->dev,
1499 "NCM: unexpected notification 0x%02x!\n",
1500 event->bNotificationType);
1501 break;
1502 }
1503 }
1504
1505 static const struct driver_info cdc_ncm_info = {
1506 .description = "CDC NCM",
1507 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
1508 .bind = cdc_ncm_bind,
1509 .unbind = cdc_ncm_unbind,
1510 .manage_power = usbnet_manage_power,
1511 .status = cdc_ncm_status,
1512 .rx_fixup = cdc_ncm_rx_fixup,
1513 .tx_fixup = cdc_ncm_tx_fixup,
1514 };
1515
1516 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1517 static const struct driver_info wwan_info = {
1518 .description = "Mobile Broadband Network Device",
1519 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1520 | FLAG_WWAN,
1521 .bind = cdc_ncm_bind,
1522 .unbind = cdc_ncm_unbind,
1523 .manage_power = usbnet_manage_power,
1524 .status = cdc_ncm_status,
1525 .rx_fixup = cdc_ncm_rx_fixup,
1526 .tx_fixup = cdc_ncm_tx_fixup,
1527 };
1528
1529 /* Same as wwan_info, but with FLAG_NOARP */
1530 static const struct driver_info wwan_noarp_info = {
1531 .description = "Mobile Broadband Network Device (NO ARP)",
1532 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1533 | FLAG_WWAN | FLAG_NOARP,
1534 .bind = cdc_ncm_bind,
1535 .unbind = cdc_ncm_unbind,
1536 .manage_power = usbnet_manage_power,
1537 .status = cdc_ncm_status,
1538 .rx_fixup = cdc_ncm_rx_fixup,
1539 .tx_fixup = cdc_ncm_tx_fixup,
1540 };
1541
1542 static const struct usb_device_id cdc_devs[] = {
1543 /* Ericsson MBM devices like F5521gw */
1544 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1545 | USB_DEVICE_ID_MATCH_VENDOR,
1546 .idVendor = 0x0bdb,
1547 .bInterfaceClass = USB_CLASS_COMM,
1548 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1549 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1550 .driver_info = (unsigned long) &wwan_info,
1551 },
1552
1553 /* Dell branded MBM devices like DW5550 */
1554 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1555 | USB_DEVICE_ID_MATCH_VENDOR,
1556 .idVendor = 0x413c,
1557 .bInterfaceClass = USB_CLASS_COMM,
1558 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1559 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1560 .driver_info = (unsigned long) &wwan_info,
1561 },
1562
1563 /* Toshiba branded MBM devices */
1564 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1565 | USB_DEVICE_ID_MATCH_VENDOR,
1566 .idVendor = 0x0930,
1567 .bInterfaceClass = USB_CLASS_COMM,
1568 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1569 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1570 .driver_info = (unsigned long) &wwan_info,
1571 },
1572
1573 /* tag Huawei devices as wwan */
1574 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1575 USB_CLASS_COMM,
1576 USB_CDC_SUBCLASS_NCM,
1577 USB_CDC_PROTO_NONE),
1578 .driver_info = (unsigned long)&wwan_info,
1579 },
1580
1581 /* Infineon(now Intel) HSPA Modem platform */
1582 { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
1583 USB_CLASS_COMM,
1584 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1585 .driver_info = (unsigned long)&wwan_noarp_info,
1586 },
1587
1588 /* Generic CDC-NCM devices */
1589 { USB_INTERFACE_INFO(USB_CLASS_COMM,
1590 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1591 .driver_info = (unsigned long)&cdc_ncm_info,
1592 },
1593 {
1594 },
1595 };
1596 MODULE_DEVICE_TABLE(usb, cdc_devs);
1597
1598 static struct usb_driver cdc_ncm_driver = {
1599 .name = "cdc_ncm",
1600 .id_table = cdc_devs,
1601 .probe = usbnet_probe,
1602 .disconnect = usbnet_disconnect,
1603 .suspend = usbnet_suspend,
1604 .resume = usbnet_resume,
1605 .reset_resume = usbnet_resume,
1606 .supports_autosuspend = 1,
1607 .disable_hub_initiated_lpm = 1,
1608 };
1609
1610 module_usb_driver(cdc_ncm_driver);
1611
1612 MODULE_AUTHOR("Hans Petter Selasky");
1613 MODULE_DESCRIPTION("USB CDC NCM host driver");
1614 MODULE_LICENSE("Dual BSD/GPL");
Michael's Linux tree.